Wheel for finishing stone



Oct. 19 1926.

1,603,516 E. A. CHASE WHEEL FOR FINISHING STONE kFiled Nov. 12, 1921 Q15y @la ljatented @et i9, i926.

TNT OFFICE.

ELROY A. CHASE, OF NORTHFIELD, VERMONT.

WHEEL son Fnvfsnnve STONE.

rllhis invention relates to a wheel particularly adapted for performing an intermediate step in the production of a polished surface on granite or other .similar stone.

ln the production of such a surface, the stone is ground roughly by a wheel or disc driven at high speed and employing very coarse grinding material. The face pro duced by this process is only an approxinately accurate plane surface.

lily improved iinishing wheel has been designed to operate upon the surface left by the coarse grinding wheel, preparing the stone for the final polishing operation. rthis intermediate operation employs a comparatively iine abrasive which will only bring the stone to an exact plane surface by a great expenditure of time.

lV ith the object in'view of reducing the time required for this intermediate operation, my invention consists in the provision of a iinishing wheel in which the working surface may adjust itself to a considerable extent to slight variations in the plane ofthe roughly ground surface.

in important feature of my invention relates to the provision of a layer of cushion material, supporting a relatively thin flexible metal face plate and permitting the plate to adjust itself to the work.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claim.

A preferred form of my invention is shown in the drawings, in which- Fig. l is a plan view of my improved iinishing wheel;

2 is a perspective view tier-cof, and

Fig. 3 is a partial side elevation.

Referring to the drawings, my improved wheel comprises a face plate 10, a layer of felt or other cushion material ll, a backing l?, preferably formed of wood, and a driving plate 13. rlhe face plate l() is formed as a single, relatively thin plate of metal. While l do not wish to be limited to the use of a particular material for this purpose, it has been found that the best results are secured by the use of a thin disc of cast iron.

rlhe cushion layer l1 is of considerable thickness and is commonly formed of heavy felt. The plate l() is secured to the cushion il by cement or shellac and the cushion 11 may be similarly secured to the lower face of the wood backing 12.

rlhis wood backing is desirably formed of several layers of material, having` the grain in the dilferent layers running in different directions, and having the several layers secured together by screwsy lll, or by other suitable fastening means.

'l`he driving plate 13 is .secured to the backing l2 by screws or bolts l5 and is provided with upwardly extending lugs or projeetionsy 16, to which a driving shaft (not shown) may be pivotally connected.

When using my improved finishing wheel, it is customary to place a fine abrasive on tbe stone in the form of a thick paste. Very little water is used in the finishing operation.

The wheel is rotated and is at the .same time forced against the surface of the stone with very considerable pressure. The cushion layer 1l permits the face plate l0 to adjust itself to slight variations in the surface of the stone, so that the surface is rapidly brought into a condition for polishing without the necessity of actual grinding away the slightly higher portions of the surface.

rlhe difference n effect in the finished surface is not noticeable while the time requiredA for the finishing operation is reduced more than percent.

Having thus described my invention, it will be evident that changes and modiiications can be made therein by those .skilled inthe art within the spirit and .scope of my invention as set forth in the claim, and I do not wish to be otherwise limited to the details herein disclosed, out what I claim 1s:-

A. stone finishing wheel having, in combination, a substantially rigid backing plate, a relatively thin flexible wear resistant metal work-engaging face plate, a relatively thick and substantially continuous layer of yielding material between .said plates, means to secure said parts together, and driving connections for Said wheel.

ln testimony whereof l have hereunto affixed my signature.

ELROY A. CHASE. 

